Never seen this kind of SMD cap failure, and question about ultrasonic cleaner.

Thread Starter

Yami

Joined Jan 18, 2016
337
Hi everyone,
I am working on a board which is in quite bad condition, bit of corrosion etc. I found this smd polarized capacitor with some kind of bulging on the side. Not sure if its some kind of glue or if the capacitor is bulged. It looks kind of white - I tried scrapping some off but it didn't work I didn't apply too much force as I didn't want to damage the capacitor. I haven't seen this kind of failure before, normally I see brownish substance leaking from electrolytic capacitors (through hole). Any idea how to confirm this? I can't get a meaningful reading from the meter, I don't want to remove it without getting a spare in. While I'm on this topic any idea where I could source these kind of capacitors seems to be a bit hard to come by.

This board is a Mini-ITX motherboard (LV-67H), do you guys think that I could use an ultrasonic cleaner to clean off the gunk off this board, especially with the processor is exposed like this.


Thanks in advance
 

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dl324

Joined Mar 30, 2015
12,255
I don't see anything to indicate that the capacitor has leaked:
clipimage.jpg
do you guys think that I could use an ultrasonic cleaner to clean off the gunk off this board,
No. Just use isopropyl alcohol or some other flux remover. Use a brush to work the crud loose; I use an acid brush with the horsehairs clipped short; a quarter inch or less remaining.

While I'm on this topic any idea where I could source these kind of capacitors seems to be a bit hard to come by.
Newark carries thousands of different surface mount electrolytic caps.
https://www.newark.com/c/passive-co...acitors/smd-aluminium-electrolytic-capacitors
 
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